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Patented Got 2, @1928 METHOD OF FIXm'G A THIN LAYER OF SPONGE RUBBER TO THE SURFACE OF INDIA- RUBBER GOODS.

No Drawing. Application filed April 14, 192?, Serial No. 183,907, and in Japan June 24, 1926.

The present invention relates to a method sulphide, and then diluted with naphtha; of fixing a thin layer of sponge rubber to thus an india rubber solution is obtained the surface of india rubber goods, in which which is to make sponge rubber. On the the india rubber solution obtained by disother hand, by dipping several times a solving unvulcanized india rubber in suitmould of finger sack in ordinary india rubable solvent such as benzine, naphtha etc, ber solution, a layer of unvulcanized rubber and adding to this solution ordinary miX- of suitable thickness is fixed on the surface tures and the materials which convert orof the mould.

dinary india rubber into spongy rubber, is The rubber layer of the mould is then applied to the surface of unvulcanized india covered with an additional thin layer, by

. rubber goods and the Whole is cured by hot dipping the mould in the above mentioned PFOCQSS sponge rubber solution a. few times and by The object of my invention is to provide curing the whole by hot process, a. thin layer rubber goods which have a very thin outer of sponge rubber being fixed to the surface or inner layer of sponge rubber by an eX- ot the finger sack.

tremely simple method at comparatively low I claim cost. A method of fixing a thin layer oi sponge The invention may clearly be understood rubber to the surface of india rubber goods, by the following example for making finger in which the india rubber solution obtained sacks. by dissolving unvulcanized india rubber in a S hundred p s 0f HTWlllCimiZed indifl suitable solvent and adding to this solution rubber: one hundred Parts Of Zinc White, ordinary mixtures and tlie materials which eight parts of lithopone, eight parts of suln t ordinary indie. rubber into spongy phur, five parts of ammonium carbonate, rubber, is applied to the surface of unvulseven parts of white substitute. two parts of canized india rubber goods and then the colouring matters, and one hundred and whole is cured by hot process, as set forth. forty parts of spindle oil are mixed In witness whereof I have signed this thoroughly by passing between mixing rollspecification. ers. The mixture is dissolved in carbon di- SATARO MORIMOTO. 

